BITD I had several bottle dynamos and they suffered all the problems listed above. They were so useless that I fitted a SA steel dynohub (weighs about 2lbs) and I used that for 50000 miles or more without issue. Its output was about 2/3rd that of a modern hub dynamo, but a quiet, reliable glow worm was infinitely preferable to a bottle dynamo or battery lights.
More recently I had a town bike with a bottle dynamo system (built in as a factory fit) and I had hoped that the intervening 30 years had improved matters, at least enough that it would be tolerable for short periods. Some hope. The generator (an AXA HR) was slightly less noisy/draggy but the connections gave all kinds of trouble (corrosion), it was still pretty draggy, it slipped, it wore the tyre, and the noise (which I like about as much as a dentist's drill) drove me berserk.
Finally (after a few thousand mile's actual use) it did the decent thing and killed itself by knackering the bearings. I did not mourn its passing. For me the typical journey with one running was only about five miles at a time, and it was such a miserable experience I really couldn't wait for it to be over.
How anyone routinely tolerates the blessed things for longer than that I cannot comprehend.
cheers